Head-Mounted Display

ABSTRACT

Embodiments relate to a head-mounted display which comprises: a light source; a lens part disposed on the optical axis of the light source; an image display part disposed apart from the lens part; a body disposed apart from the image display part, including a correction lens having protruding parts disposed at the center of the top and bottom surfaces thereof, and having a first hole, forming a path through which the protruding parts pass and the correction lens moves, disposed in a direction parallel to the optical axis; a correction lens position adjusting part having at least one second hole disposed therein which is coupled to the protruding parts passing through the first hole, surrounding the body, and moving in a direction parallel to the optical axis; and an image viewing part connected to the body.

TECHNICAL FIELD

Embodiments relate to a head-mounted display, and more particularly, toa head-mounted display which enables an image to be clearly viewed bycompensating for the user's eyesight using a correction lens that isadjustable in position.

BACKGROUND ART

A head-mounted display (HMD) is a device with which a user can view animage while closely wearing the same over both of his/her eyes. Thehead-mounted display has been widely used because it is wornindividually, has a small size, and provides a wide viewing angle.

In addition, the head-mounted display is a device that enlarges an imagedisplayed on a display device, such as an LCD or a CRT, using an opticalsystem and shows the enlarged image to the user. The head-mounteddisplay needs to focus on a very short distance because an image screenthereof is located very close to the eyes, and also requires veryprecise optical devices in order to prevent eye fatigue.

A conventional head-mounted display is disclosed in Korean PatentLaid-Open Publication No. 10-2013-0037344. The conventional head-mounteddisplay is a wearable display system that displays an input imagesignal, and includes an object lens that enlarges the image signal, adiffractive lattice that diffracts the image signal enlarged via theobject lens to a predetermined angle, a wave guide that propagates thesignal diffracted by the diffractive lattice, and an eye lens that formsan image of the image signal propagated through the wave guide so as toallow a user to view the image. The conventional head-mounted displaymay obtain a high-magnification image by primarily enlarging an image tobe displayed by a refractive lens and secondarily enlarging the image byan eye lens, and may maximize the user's visual field.

However, when a user wearing glasses wears the head-mounted display, theuser may feel uncomfortable. Meanwhile, when a user with poor eyesightwears the head-mounted display only, the user may not view a clearimage.

Technical Object

Embodiments are devised to solve the problems described above, and anobject of the embodiments is to provide a head-mounted display which mayadjust the position of a correction lens so as to compensate for theuser's eyesight.

Technical Solution

To achieve the object described above, an embodiment provides ahead-mounted display including a body including a light source, a lensunit disposed on an optical axis of the light source, an image displayunit disposed so as to be spaced apart from the lens unit, and acorrection lens disposed so as to be spaced apart from the image displayunit and having a protrusion disposed on a center of each of upper andlower surfaces thereof, the body being provided with a first hole,through which the protrusion passes so as to define a path along whichthe correction lens is moved, in such a manner that the first hole isformed in a direction parallel to the optical axis, a correction lensposition adjustment unit having at least one second hole, into which theprotrusion that has passed through the first hole is coupled, thecorrection lens position adjustment unit being configured to surroundthe body and to move in the direction parallel to the optical axis, andan image-viewing unit disposed so as to be connected to the body.

In the embodiment, the correction lens position adjustment unit mayinclude an upper frame configured to surround a portion of an uppersurface and a side surface of the body, and a lower frame configured tosurround a lower surface of the body and a side surface of the upperframe, and the at least one second hole may include a second-first holeformed in the upper frame and a second-second hole formed in the lowerframe.

In addition, the correction lens position adjustment unit may furtherinclude a coupling unit configured to couple the upper frame and thelower frame to each other, and the coupling unit may include a couplingprotrusion disposed on a lower end portion of each of opposite sidesurfaces of the upper frame and configured to be inclined upwardrelative to the side surface of the upper frame and a coupling holeformed in each of opposite side surfaces of the lower frame so as tocorrespond to the coupling protrusion.

In addition, the lower frame may be provided with a stepped holdingportion, which comes into contact with a lower end surface of the upperframe.

In addition, the head-mounted display may further include anti-pushingmembers disposed respectively on one end and a remaining end of thecorrection lens position adjustment unit in the direction parallel tothe optical axis.

In addition, the correction lens position adjustment unit may furtherinclude a fixing unit configured to fix the correction lens positionadjustment unit to the body.

In addition, the fixing unit may include a third hole formed in one sidesurface of the correction lens position adjustment unit and providedwith screw-threads; and a fixing pin screwed into the third hole.

Meanwhile, the correction lens position adjustment unit may furtherinclude an anti-slip portion formed on upper and lower surfaces thereofand having a plurality of linear grooves formed in a directionorthogonal to the optical axis.

In addition, the correction lens may have negative refractive power.

In addition, the body may be provided with a stepped surface at aposition at which the correction lens is disposed, and opposite edges ofthe correction lens may move along the stepped surface.

Another embodiment provides a head-mounted display including a lightsource, a lens unit disposed on an optical axis of the light source, animage display unit disposed so as to be spaced apart from the lens unit,an image-viewing unit disposed so as to be spaced apart from the imagedisplay unit, a correction lens disposed between the image display unitand the image-viewing unit, a body disposed in a direction parallel tothe optical axis so that the light source, the lens unit, and the imagedisplay unit are sequentially disposed therein, and a correction lensposition adjustment unit configured to surround the body and to move aposition of the correction lens between the image display unit and theimage-viewing unit.

In the embodiment, the correction lens may have a protrusion formed oneach of upper and lower surfaces thereof, and the protrusion may passthrough a first hole formed in the body in the direction parallel to theoptical axis so as to move along the first hole.

In addition, the lens unit may include a first lens and a second lens.

In addition, the first lens and the second lens may include at least onespherical lens, or may include at least one aspherical lens.

In addition, the correction lens may have negative refractive power.

In addition, the correction lens position adjustment unit may furtherinclude a fixing unit configured to fix the correction lens positionadjustment unit to the body.

In addition, the fixing unit may include a third hole formed in one sidesurface of the correction lens position adjustment unit and providedwith screw-threads and a fixing pin screwed into the third hole.

A further embodiment provides a head-mounted display including a body inwhich a light source, a lens unit on an optical axis of the lightsource, an image display unit, and a correction lens are sequentiallydisposed, an image-viewing unit disposed so as to be spaced apart fromthe correction lens and to be connected to the body, and a correctionlens position adjustment unit configured to surround the body and tomove a position of the correction lens, wherein the correction lensposition adjustment unit includes an anti-slip portion.

In addition, the anti-slip portion may have a plurality of lineargrooves formed in upper and lower surfaces thereof in a directionorthogonal to the optical axis.

Advantageous Effects

According to the embodiments described above, by adjusting the positionof a correction lens, it is possible to allow a user who has pooreyesight to view a clear image while compensating for the user'seyesight.

In addition, since the user who has poor eyesight can see an image bywearing only a head-mounted display without wearing glasses, the wearingcomfort of the user may be improved, which may alleviate the discomfortof the user.

DESCRIPTION OF DRAWINGS

FIG. 1 is a perspective view illustrating a head-mounted displayaccording to an embodiment.

FIG. 2 is a perspective view illustrating the cross section taken alongline A-A′ of FIG. 1.

FIG. 3 is an exploded perspective view illustrating the head-mounteddisplay according to the embodiment.

FIG. 4a is a perspective view illustrating a correction lens positionadjustment unit according to the embodiment.

FIG. 4b is an exploded perspective view illustrating the correction lensposition adjustment unit according to the embodiment.

FIG. 5a is a view illustrating the position of a correction lens when auser is nearsighted.

FIG. 5b is a view illustrating the position of a correction lens when auser is farsighted.

BEST MODE

Hereinafter, exemplary embodiments will be described in detail withreference to the accompanying drawings, in order to concretely realizethe object described above.

FIG. 1 is a perspective view illustrating a head-mounted displayaccording to an embodiment, FIG. 2 is a perspective view illustratingthe cross section taken along line A-A′ of FIG. 1, and FIG. 3 is anexploded perspective view illustrating the head-mounted displayaccording to the embodiment.

Referring to FIGS. 1 to 3, the head-mounted display 1000 according tothe present embodiment includes a body 100, which includes a lightsource 110, a lens unit 120, an image display unit 130, and a correctionlens 140, a correction lens position adjustment unit 200, and animage-viewing unit 300.

The light source 110, the lens unit 120, the image display unit 130, andthe correction lens 140 may be disposed side by side in the body 100.

The light source 110 may be disposed in one end of the body 100, and mayserve as a backlight of a display element of the image display unit,which will be described later. In addition, the light source 110 may beprovided as a lamp including a light-emitting diode (LED), a coldcathode fluorescent light (CCFL) or the like, and may adjust thebrightness of an image depending on the quantity of light of the lamp.

The lens unit 120 may be disposed on the optical axis of the lightsource 110 and may be located in front of the light source in thedirection in which light travels so as to collect the light emitted fromthe light source 110 so that light having high illuminance may passthrough the image display unit 130. In addition, the lens unit 120 mayinclude a first lens 122 and a second lens 124, and the first lens 122and the second lens 124 may be configured as a combination of lensesselected from among at least one spherical lens and at least oneaspherical lens.

The image display unit 130 may be disposed on the optical axis of thelight source 110 so as to be spaced apart from the lens unit 120, andmay serve to emit light that forms an image. In addition, the imagedisplay unit 130 may include a display element 134 and a substrate 132on which the display element 134 is mounted. In the embodiment, thedisplay element 134 may be a light-transmitting liquid crystal display(LCD) coupled with a light source, but may be realized as any of variousdevices or elements, such as an organic light-emitting diode (OLED) thatrequires no light source.

The correction lens 140 may be disposed so as to be spaced apart fromthe image display unit 130, and may move between the image-viewing unit300, which is connected to the body 100, and the image display unit 130.

Here, the correction lens 140 may have negative refractive power. Theposition of the correction lens 140 may be moved between the imagedisplay unit 130 and the image-viewing unit 300, which enablesadjustment in the position of an image focus so that an image providedfrom the image display unit 130 is transferred as a clear image adjustedto compensate for the user's eyesight.

Next, the structure of the correction lens 140, which enables themovement of the correction lens 140 between the image-viewing unit 300and the image display unit 130, will be described in detail.

FIG. 4a is a perspective view illustrating a correction lens positionadjustment unit according to the embodiment, and FIG. 4b is an explodedperspective view illustrating the correction lens position adjustmentunit according to the embodiment.

Referring to FIGS. 4a and 4b , protrusions 142 may be disposed on thecenter of the upper and lower surfaces of the correction lens 140. Theprotrusions 142 may include a first protrusion 142 a formed on the uppersurface of the correction lens 140 and a second protrusion 142 b formedon the lower surface of the correction lens 140.

The first protrusion 142 a and the second protrusion 142 b may be formedin a cylindrical shape at vertically symmetrical positions.

The body 100 may have therein first holes 150, through which theprotrusions 142 pass so as to define the path along which the correctionlens 140 is movable. A first-first hole 150-1, through which the firstprotrusion 142 a passes, and a first-second hole 150-2, through whichthe second protrusion 142 b passes, may be respectively formed in theupper and lower surfaces of the body 100.

Here, the first-first hole 150-1 and the first-second hole 150-2 may bedisposed in a direction parallel to the optical axis (the longitudinaldirection of the body).

In order to allow the first protrusion 142 a and the second protrusion142 b to move in the first-first hole 150-1 and the first-second hole150-2, the respective widths of the first-first hole 150-1 and thefirst-second hole 150-2 may be greater than the respective diameters ofthe first protrusion 142 a and the second protrusion 142 b.

The first protrusion 142 a and the second protrusion 142 b describedabove may be coupled to the correction lens position adjustment unit 200so that the position of the correction lens 140 is movable. Thecorrection lens position adjustment unit 200 may surround the body 100and may move in a direction parallel to the optical axis so as to adjustthe position of the correction lens 140.

In addition, the correction lens position adjustment unit 200 mayinclude an upper frame 210 having a “

”-shaped cross section and a lower frame 220 having a “

”-shaped cross section.

In addition, the inner width of the upper frame 210 may be equal to thewidth of the body 100 so that the upper frame 210 is disposed so as tosurround a portion of the upper surface and the side surface of the body100. The lower frame 220 may be disposed so as to surround the lowersurface of the body 100 and the side surface of the upper frame 210.

The correction lens position adjustment unit 200 may further include acoupling unit 230, which couples the upper frame 210 and the lower frame220 to each other.

Here, the coupling unit 230 may include coupling protrusions 232, whichare disposed on the lower end portions of opposite side surfaces of theupper frame 210 and coupling holes 234, which are formed in oppositeside surfaces of the lower frame 220 so as to correspond to therespective coupling protrusions 232. In addition, each couplingprotrusion 232 may be inclined upward relative to the side surface ofthe upper frame 210, and with the inclined surface of the couplingprotrusion 232, the coupling protrusion may be easily coupled into thecoupling hole 234 in the lower frame 220.

In addition, the upper end surface of the coupling protrusion 232 mayhave a thickness corresponding to the thickness of the sidewall of thelower frame 220. As such, when the coupling protrusion 232 is fittedinto the coupling hole 234, the upper end surface of the couplingprotrusion 232 may be brought into contact with the upper surface of thecoupling hole 234, whereby the upper frame 210 and the lower frame 220may be coupled to each other.

In addition, in order to prevent the coupling protrusion 232 from beingseparated from the coupling hole 234, the lower frame 220 may beprovided with a stepped holding portion 224, which is brought intocontact with the lower end surface of the upper frame 210 when thecoupling protrusion 232 is coupled into the coupling hole 234. Inaddition, the upper frame 210 may be provided with a second steppedholding portion 214, which has a height corresponding to the thicknessof the sidewall of the lower frame 220.

The coupling unit 230 described above is configured to couple the upperframe 210 and the lower frame 220 to each other as the couplingprotrusions 232 are fitted into the coupling holes 234, withoutlimitation thereto.

Meanwhile, the correction lens position adjustment unit 200 may have oneor more second holes 212 and 222, into which the protrusions 142 thathave passed through the first holes 150 are coupled.

The second holes 212 and 222 may include a second-first hole 212 formedin the upper frame 210 and a second-second hole 222 formed in the lowerframe 220.

In addition, the first protrusion 142 a and the second protrusion 142 bmay be coupled respectively into the second-first hole 212 and thesecond-second hole 222. The second-first hole 212 and the second-secondhole 222 may have a planar shape and size corresponding to those of thefirst protrusion 142 a and the second protrusion 142 b so that the firstprotrusion 142 a and the second protrusion 142 b are fitted and coupledinto the second-first hole 212 and the second-second hole 222.

Thus, as illustrated in FIGS. 1 to 4 b, the correction lens 140 may becoupled to the correction lens position adjustment unit 200 so that theposition of the correction lens 140 may be adjusted between the imagedisplay unit 130 and the image-viewing unit 300 in a direction parallelto the optical axis along the second holes 212 and 222 formed in thebody 100.

In addition, the correction lens position adjustment unit 200 mayfurther include anti-pushing members 240, which prevent the correctionlens position adjustment unit 200 from being pushed onto the body 100after the correction lens position adjustment unit 200 is moved toadjust the position of the correction lens 140 so as to compensate forthe user's eyesight. The anti-pushing members 240 may be disposedrespectively on one end and the other end of the correction lensposition adjustment unit 200 in a direction parallel to the opticalaxis, and may be formed of a rubber material.

The anti-pushing members 240 may allow the correction lens positionadjustment unit 200 to be moved when the user applies a certain force tothe correction lens position adjustment unit 200, but may prevent thecorrection lens position adjustment unit 200 from being slightly movedalong the body once the movement of the correction lens positionadjustment unit 200 has stopped.

In the embodiment, the anti-pushing members 240 may take the form ofrings provided on one end and the other end of the correction lensposition adjustment unit 200, but the material or form of theanti-pushing members is not limited thereto.

In addition, the correction lens position adjustment unit 200 mayfurther include a fixing unit 250, which fixes the correction lensposition adjustment unit 200 to the body 100.

The fixing unit 250 may include a third hole 252 formed in one sidesurface of the correction lens position adjustment unit 200 and a fixingpin 254 coupled to the third hole 252.

In the embodiment, the third hole 252 may be formed in one side of theupper surface of the upper frame 210 of the correction lens positionadjustment unit 200. The third hole 252 may be provided withscrew-threads so that the fixing pin 254 in the form of a bolt may bescrewed into the third hole 252.

Thus, once the position of the correction lens 140 has been adjusted tocompensate for the user's eyesight, the fixing pin 254 may be screwedinto the third hole 252 so that the lower end surface of the fixing pin254 presses the upper end surface of the body 100, whereby thecorrection lens position adjustment unit 200 may be fixed to the body100. The structure of the fixing unit 250 is not limited thereto.

Meanwhile, the correction lens position adjustment unit 200 may furtherinclude an anti-slip portion 260, which prevents the user's hand fromslipping from the correction lens position adjustment unit 200 when theuser moves the correction lens position adjustment unit 200. Theanti-slip portion 260 may include a plurality of linear grooves 262,which is formed in the upper and lower surfaces of the correction lensposition adjustment unit 200 in a direction orthogonal to the opticalaxis. However, the anti-slip portion 260 is not limited to thisstructure so long as it may prevent the user's hand from slipping fromthe correction lens position adjustment unit 200 when the user moves thecorrection lens position adjustment unit.

The body 100 may have stepped surfaces 160 formed at the position atwhich the correction lens 140 is disposed, and opposite edges of thecorrection lens 140 may move along the stepped surfaces 160.

The image-viewing unit 300 may be disposed so as to be connected to thebody 100. In addition, the image-viewing unit 300 may include acorrection mirror (not illustrated), which changes the angle of theoptical axis of an image provided from the correction lens 140 so as toreflect the image.

As described above, the correction lens 140 may adjust the focaldistance of an image so as to compensate for the user's eyesight bybeing moved between the image display unit 130 and the image-viewingunit 300.

FIG. 5a is a view illustrating the position of the correction lens whenthe user is nearsighted, and FIG. 5b is a view illustrating the positionof the correction lens when the user is farsighted.

Referring to FIGS. 5a and 5b , when the user is nearsighted, the focusis not on the retina, but forward of the retina. Therefore, thecorrection lens 140 may be moved from the image display unit 130 towardthe image-viewing unit 300 to adjust the focal position of the image sothat the image may be focused on the retina.

On the other hand, when the user is farsighted, the focus is not on theretina, but behind the retina. Therefore, the correction lens 140 may bemoved from the image-viewing unit 300 toward the image display unit 130to adjust the focal position of the image so that the image may befocused on the retina.

As described above, according to the embodiment, by adjusting theposition of the correction lens disposed between the image display unitand the image-viewing unit, it is possible to allow the user who haspoor eyesight to view a clear image by compensating for the user'seyesight. In addition, since the user who has poor eyesight can see animage by wearing only a head-mounted display without wearing glasses,the user is not required to wear both the glasses and the head-mounteddisplay, which is uncomfortable, thereby improving wearing comfort.

Although embodiments have been described above, the above description ismerely given by way of example and is not intended to limit thedisclosure, and it will be apparent to those skilled in the art thatvarious modifications and applications, which are not exemplified above,may be devised without departing from the essential characteristics ofthe embodiments. For example, the respective constituent elementsdescribed in the embodiments may be modified in various ways. Inaddition, differences associated with these modifications andalterations should be interpreted as being included in the scope of thedisclosure defined by the accompanying claims.

MODE FOR INVENTION

Modes for the implementation of embodiments have sufficiently beendescribed in the “best mode” described above.

INDUSTRIAL APPLICABILITY

Embodiments may realize a head-mounted display in which the position ofa correction lens may be adjusted to compensate for the user's eyesightso as to allow a user who has poor eyesight to view an image by wearingonly a head-mounted display without wearing glasses, resulting inimproved wearing comfort.

1. A head-mounted display comprising; a body including: a light source;a lens unit disposed on an optical axis of the light source; an imagedisplay unit disposed so as to be spaced apart from the lens unit; and acorrection lens disposed so as to be spaced apart from the image displayunit and having a protrusion disposed on a center of each of upper andlower surfaces thereof, the body being provided with a first hole,through which the protrusion passes so as to define a path along whichthe correction lens is moved, in such a manner that the first hole isformed in a direction parallel to the optical axis; a correction lensposition adjustment unit having at least one second hole, into which theprotrusion that has passed through the first hole is coupled, thecorrection lens position adjustment unit being configured to surroundthe body and to move in the direction parallel to the optical axis; andan image-viewing unit disposed so as to be connected to the body,wherein the correction lens position adjustment unit includes an upperframe configured to surround a portion of an upper surface and a sidesurface of the body, and a lower frame configured to surround a lowersurface of the body and a side surface of the upper frame.
 2. Thehead-mounted display according to claim 1, wherein the at least onesecond hole includes: a second-first hole formed in the upper frame; anda second-second hole formed in the lower frame.
 3. The head-mounteddisplay according to claim 1, wherein the correction lens positionadjustment unit further includes a coupling unit configured to couplethe upper frame and the lower frame to each other, and wherein thecoupling unit includes: a coupling protrusion disposed on a lower endportion of each of opposite side surfaces of the upper frame andconfigured to be inclined upward relative to the side surface of theupper frame; and a coupling hole formed in each of opposite sidesurfaces of the lower frame so as to correspond to the couplingprotrusion.
 4. The head-mounted display according to claim 1, whereinthe lower frame is provided with a stepped holding portion, which comesinto contact with a lower end surface of the upper frame.
 5. Thehead-mounted display according to claim 1, further comprisinganti-pushing members disposed respectively on one end and a remainingend of the correction lens position adjustment unit in the directionparallel to the optical axis.
 6. The head-mounted display according toclaim 1, wherein the correction lens position adjustment unit furtherincludes a fixing unit configured to fix the correction lens positionadjustment unit to the body.
 7. The head-mounted display according toclaim 6, wherein the fixing unit includes: a third hole formed in oneside surface of the correction lens position adjustment unit andprovided with screw-threads; and a fixing pin screwed into the thirdhole.
 8. The head-mounted display according to claim 1, wherein thecorrection lens position adjustment unit further includes an anti-slipportion formed on upper and lower surfaces thereof and having aplurality of linear grooves formed in a direction orthogonal to theoptical axis.
 9. The head-mounted display according to claim 1, whereinthe correction lens has negative refractive power.
 10. The head-mounteddisplay according to claim 1, wherein the body is provided with astepped surface at a position at which the correction lens is disposed,and opposite edges of the correction lens move along the steppedsurface.
 11. A head-mounted display comprising: a light source; a lensunit disposed on an optical axis of the light source; an image displayunit disposed so as to be spaced apart from the lens unit; animage-viewing unit disposed so as to be spaced apart from the imagedisplay unit; a correction lens disposed between the image display unitand the image-viewing unit; a body disposed in a direction parallel tothe optical axis so that the light source, the lens unit, and the imagedisplay unit are sequentially disposed therein; and a correction lensposition adjustment unit configured to surround the body and to move aposition of the correction lens between the image display unit and theimage-viewing unit wherein the lens unit includes a first lens and asecond lens.
 12. The head-mounted display according to claim 11, whereinthe correction lens has a protrusion formed on each of upper and lowersurfaces thereof, and the protrusion passes through a first hole formedin the body in the direction parallel to the optical axis so as to movealong the first hole.
 13. (canceled)
 14. The head-mounted displayaccording to claim 11, wherein the first lens and the second lensinclude at least one spherical lens.
 15. The head-mounted displayaccording to claim 11, wherein the first lens and the second lensinclude at least one aspherical lens.
 16. The head-mounted displayaccording to claim 11, wherein the correction lens has negativerefractive power.
 17. The head-mounted display according to claim 11,wherein the correction lens position adjustment unit further includes afixing unit configured to fix the correction lens position adjustmentunit to the body.
 18. The head-mounted display according to claim 17,wherein the fixing unit includes: a third hole formed in one sidesurface of the correction lens position adjustment unit and providedwith screw-threads; and a fixing pin screwed into the third hole.
 19. Ahead-mounted display comprising: a body in which a light source, a lensunit on an optical axis of the light source, an image display unit, anda correction lens are sequentially disposed; an image-viewing unitdisposed so as to be spaced apart from the correction lens and to beconnected to the body; and a correction lens position adjustment unitconfigured to surround the body and to move a position of the correctionlens, wherein the correction lens position adjustment unit includes ananti-slip portion.
 20. The head-mounted display according to claim 19,wherein the anti-slip portion has a plurality of linear grooves formedin upper and lower surfaces thereof in a direction orthogonal to theoptical axis.
 21. The head-mounted display according to claim 18,wherein the body is provided with a stepped surface at a position atwhich the correction lens is disposed, and opposite edges of thecorrection lens is disposed to move along the stepped surface.